Newb here. Did i buy a money pit?
 

Hey guys/gals. Just Bought a 2007 Mazda 5 with 163k. Having some issues maybe someone can give some pointers. #1. Engine shakes when im at a red light. Oil presure light flickers. Codes p0301 and p0480. Changed Ignition coil (helped restore power) on Cyl 1 and new plugs. Plugs had a little oil on em.